286 lines
7.2 KiB
C++
286 lines
7.2 KiB
C++
// bootstrap.cxx -- bootstrap routines: main()
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//
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// Written by Curtis Olson, started May 1997.
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//
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// Copyright (C) 1997 - 2002 Curtis L. Olson - http://www.flightgear.org/~curt
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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// $Id$
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifdef HAVE_WINDOWS_H
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#include <windows.h>
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#endif
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#if defined(HAVE_FEENABLEEXCEPT)
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <fenv.h>
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#elif defined(__linux__) && defined(__i386__)
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# include <fpu_control.h>
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#endif
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#ifndef _WIN32
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# include <unistd.h> // for gethostname()
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#endif
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#include <errno.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <simgear/compiler.h>
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#include <simgear/structure/exception.hxx>
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#include <simgear/debug/logstream.hxx>
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#include <cstring>
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#include <iostream>
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using std::cerr;
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using std::endl;
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#include <Viewer/fgviewer.hxx>
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#include "main.hxx"
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#include "globals.hxx"
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#include "fg_props.hxx"
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#include "fg_os.hxx"
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string homedir;
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string hostname;
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// forward declaration.
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void fgExitCleanup();
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static bool fpeAbort = false;
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static void initFPE();
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#if defined(HAVE_FEENABLEEXCEPT)
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static void handleFPE(int);
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static void
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initFPE ()
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{
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if (fpeAbort) {
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int except = fegetexcept();
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feenableexcept(except | FE_DIVBYZERO | FE_INVALID);
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} else {
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signal(SIGFPE, handleFPE);
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}
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}
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static void handleFPE(int)
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{
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feclearexcept(FE_ALL_EXCEPT);
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signal(SIGFPE, handleFPE);
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}
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#elif defined(__linux__) && defined(__i386__)
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static void handleFPE(int);
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static void
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initFPE ()
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{
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fpu_control_t fpe_flags = 0;
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_FPU_GETCW(fpe_flags);
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// fpe_flags &= ~_FPU_MASK_IM; // invalid operation
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// fpe_flags &= ~_FPU_MASK_DM; // denormalized operand
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// fpe_flags &= ~_FPU_MASK_ZM; // zero-divide
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// fpe_flags &= ~_FPU_MASK_OM; // overflow
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// fpe_flags &= ~_FPU_MASK_UM; // underflow
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// fpe_flags &= ~_FPU_MASK_PM; // precision (inexact result)
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_FPU_SETCW(fpe_flags);
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signal(SIGFPE, handleFPE);
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}
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static void
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handleFPE (int num)
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{
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initFPE();
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SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
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}
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#else
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static void initFPE()
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{
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}
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#endif
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#ifdef _MSC_VER
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int main ( int argc, char **argv );
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int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
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LPSTR lpCmdLine, int nCmdShow) {
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logbuf::has_no_console();
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main( __argc, __argv );
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}
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#endif
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#if defined( sgi )
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#include <sys/fpu.h>
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#include <sys/sysmp.h>
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#include <unistd.h>
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/*
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* set the special "flush zero" bit (FS, bit 24) in the Control Status
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* Register of the FPU of R4k and beyond so that the result of any
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* underflowing operation will be clamped to zero, and no exception of
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* any kind will be generated on the CPU. This has no effect on an
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* R3000.
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*/
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void flush_fpe(void)
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{
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union fpc_csr f;
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f.fc_word = get_fpc_csr();
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f.fc_struct.flush = 1;
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set_fpc_csr(f.fc_word);
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}
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#endif
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static void fg_terminate() {
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cerr << endl <<
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"Uncaught Exception: you should see a meaningful error message\n"
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"here, but your GLUT (or SDL) library was apparently compiled\n"
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"and/or linked without exception support. Please complain to\n"
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"its provider!"
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<< endl << endl;
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abort();
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}
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int _bootstrap_OSInit;
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// Main entry point; catch any exceptions that have made it this far.
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int main ( int argc, char **argv ) {
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#if _MSC_VER
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// Don't show blocking "no disk in drive" error messages on Windows 7,
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// silently return errors to application instead.
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// See Microsoft MSDN #ms680621: "GUI apps should specify SEM_NOOPENFILEERRORBOX"
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SetErrorMode(SEM_NOOPENFILEERRORBOX);
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// Windows has no $HOME aka %HOME%, so we have to construct the full path.
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homedir = ::getenv("APPDATA");
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homedir.append("\\flightgear.org");
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hostname = ::getenv( "COMPUTERNAME" );
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#else
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// Unix(alike) systems
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char _hostname[256];
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gethostname(_hostname, 256);
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hostname = _hostname;
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homedir = ::getenv( "HOME" );
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signal(SIGPIPE, SIG_IGN);
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#endif
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#ifdef PTW32_STATIC_LIB
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// Initialise static pthread win32 lib
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pthread_win32_process_attach_np ();
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#endif
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_bootstrap_OSInit = 0;
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#if defined(__FreeBSD__)
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// Ignore floating-point exceptions on FreeBSD
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signal(SIGFPE, SIG_IGN);
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#else
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// Maybe Enable floating-point exceptions on Linux
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for (int i = 0; i < argc; ++i) {
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if (!strcmp("--enable-fpe", argv[i])) {
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fpeAbort = true;
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break;
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}
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}
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initFPE();
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#endif
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#if defined(sgi)
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flush_fpe();
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// Bind all non-rendering threads to CPU1
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// This will reduce the jitter caused by them to an absolute minimum,
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// but it will only work with superuser authority.
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if ( geteuid() == 0 )
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{
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sysmp(MP_CLOCK, 0); // bind the timer only to CPU0
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sysmp(MP_ISOLATE, 1 ); // Isolate CPU1
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sysmp(MP_NONPREEMPTIVE, 1 ); // disable process time slicing on CPU1
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}
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#endif
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// Enable floating-point exceptions for Windows
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#if defined( _MSC_VER ) && defined( DEBUG )
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// Christian, we should document what this does
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_control87( _EM_INEXACT, _MCW_EM );
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#endif
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#if defined( HAVE_BC5PLUS )
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_control87(MCW_EM, MCW_EM); /* defined in float.h */
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#endif
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bool fgviewer = false;
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for (int i = 0; i < argc; ++i) {
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if (!strcmp("--fgviewer", argv[i])) {
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fgviewer = true;
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break;
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}
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}
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// FIXME: add other, more specific
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// exceptions.
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try {
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std::set_terminate(fg_terminate);
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atexit(fgExitCleanup);
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if (fgviewer)
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fgviewerMain(argc, argv);
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else
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fgMainInit(argc, argv);
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} catch (const sg_throwable &t) {
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// We must use cerr rather than
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// logging, since logging may be
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// disabled.
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cerr << "Fatal error: " << t.getFormattedMessage() << endl;
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if (std::strlen(t.getOrigin()) != 0)
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cerr << " (received from " << t.getOrigin() << ')' << endl;
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} catch (const string &s) {
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cerr << "Fatal error: " << s << endl;
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} catch (const char *s) {
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cerr << "Fatal error: " << s << endl;
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} catch (...) {
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cerr << "Unknown exception in the main loop. Aborting..." << endl;
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if (errno)
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perror("Possible cause");
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}
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return 0;
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}
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// do some clean up on exit. Specifically we want to call alutExit()
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// which happens in the sound manager destructor.
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void fgExitCleanup() {
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if (_bootstrap_OSInit != 0)
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fgSetMouseCursor(MOUSE_CURSOR_POINTER);
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delete globals;
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}
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